QUOTE(Psykomantis00 @ Jun 12 2007, 05:42 AM)
These do not actually do anything. But you can gain horsepower by a decent tune. The factory ECU tune is very conservative.
As is the torque converter on the tranny. I'm told a solid aftermarket torque converter will turn this thing into an absolute tire-squealing beast. Kind of a trade-off though as one of the things I love about my Lexus is that it is a very smooth shifter. On the bright side though, I did learn that when the dealer replaced the catalytic converters on my car, they put aftermarket ones on them and they sure look alot like the Magnaflows that are available for my car. So I just need to add the K&N that I have on order and find a decent cat back exhaust and I should have some good airflow.